Narwhal unifies Kalshi and Polymarket odds for economics, central bank decisions, metals and energy. Odds-API.io lists both venues within a sportsbook API covering 415+ bookmakers and 34 sports. Its prediction guide covers sports events and top-of-book prices only.
Choose Narwhal for economic and commodity prediction odds with REST, MCP and paid streaming. Choose Odds-API.io for sports odds across bookmakers, subject to its bookmaker plan limits.
Odds-API.io's prediction guide covers sports; Narwhal's prediction topics exclude sports. Narwhal API is owned and operated by Nusantara Ventures, LLC.
| Requirement | Narwhal API | Odds-API.io |
|---|---|---|
| Free tier | ✓ 5,000 requests/month | ✗ New free API keys paused indefinitely |
| Cheapest paid plan | Basic: $59/month; $590/year available | Solo: from $65/month; 2 bookmakers |
| Update speed | Free: previous day's close; Basic/Pro: live | WebSocket add-on; twice the plan price |
| History | Free: 12 months; Basic: 5 years; available records only | Not published |
| Coverage | Kalshi/Polymarket: economics, central banks, metals, energy | 415+ bookmakers; 34 sports |
| Interfaces | REST, MCP; Basic/Pro: WebSocket | Odds API, MCP and WebSocket add-on |
| SDKs | ✓ Official Python and TypeScript SDKs | Not published |
| Commercial use on free tier | ✓ Commercial apps; resale needs Enterprise | Not stated |
Solo allows 5,000 requests/hour; whether prediction venues count toward its two-bookmaker cap is not stated.
| Requests per month | Narwhal API | Odds-API.io |
|---|---|---|
| 1,000 | Free: $0/month | Solo: from $65/month |
| 10,000 | Basic: $59/month | Solo: from $65/month |
| 100,000 | Basic: $59/month | Solo: from $65/month |
List prediction topics
The cited prediction guide does not publish the request format for Kalshi or Polymarket.
# Change: URL and key
curl \
"https://api.narwhalapi.com/v1/predictions/topics" \
-H "Authorization: Bearer YOUR_API_KEY"Narwhal Free includes 5,000 successful requests each month and permits commercial apps. Use that allowance for a dashboard, scheduled data fetches or an agent integration. Move to Basic for 100,000 monthly requests as usage grows, with the same account and authentication.
REST and hosted MCP reach the same data through one account. Your application can fetch JSON while an agent uses the hosted tools, with every successful call counted once against the shared allowance. One quota makes the combined workload straightforward to budget.
Narwhal gives Kalshi and Polymarket one schema for economic releases, central bank decisions, metals and energy. Events use scalar, binary, extremes and timing shapes and name their official resolution source. Economic events link to the Narwhal endpoint publishing the actual value. Odds history supports intervals from 1 minute to daily.
Odds-API.io suits sports applications comparing odds across 415+ bookmakers and 34 sports. Its prediction guide covers Kalshi moneyline, spread, totals and both teams to score, plus Polymarket moneyline, totals and both teams to score. Coverage is top of book only. Paid plans include 5,000 requests an hour, with bookmaker caps varying by plan. An official MCP server is available on npm and GitHub. WebSocket access costs twice the plan price as an add-on.
Yes. Narwhal Free includes 5,000 successful requests per month, commercial app use and both REST and hosted MCP access. Free returns the previous day's close for prediction odds; live odds and WebSocket streaming require Basic or Pro.
Its prediction guide covers sports events only and top-of-book prices. Kalshi markets include moneyline, spread, totals and both teams to score; Polymarket includes moneyline, totals and both teams to score. Narwhal covers 57 topics on economic releases, central bank decisions, metals and energy, excluding sports, politics and crypto.
Replace the request URL and authentication, then map the JSON response into your application's fields. The examples use standard fetch in JavaScript and requests in Python, so integration fits an ordinary HTTP client. Keep your key on the server and carry the response's units, dates and missing values into your display or calculations.
The shared cap applies to successful REST and MCP requests together. There are no automatic overage charges. Basic includes 100,000 monthly requests; quotas reset each month even when you pay yearly.
The comparison uses Narwhal's current public contract and the following first-party competitor pages.
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